Ashbrook, F. G. (Frank Getz), 1892- & Earnshaw, Frank L. Laws relating to fur animals for the season 1925-26., book, September 1925; (https://digital.library.unt.edu/ark:/67531/metadc6190/m1/1/: accessed October 18, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; .